The last drives reviewed here were 3.5" external drives. Like with internal magnetic hard drives, 3.5" external drives have the upper hand to their 2.5" brothers. But while they win on the performance front, they have some downsides too. The 2.5" drives are obviously smaller and they use less power (and thus can be powered via USB). You can use them on the go without an AC outlet, and you don't have to carry around a larger drive with an AC power brick. Today, we'll be looking at a popular 2.5" drive from Seagate, the FreeAgent GoFlex Ultra-portable USB 3.0 hard drive. It's available in capacities ranging from 320GB to 1.5TB, and we'll be looking at the middle-sized 750GB drive.